Electromagnetic induction apparatus

ABSTRACT

An electromagnetic induction apparatus is provided which comprises outer and inner cores and first and second windings on the outer and inner cores. Depending upon the relative angular position between the first and second windings the effects of the magnetic fluxes produced by the first and second windings upon the other or the degree of the inductive coupling between the first and second windings may be varied, so that the output voltage may be varied accordingly. That is, the magnetic flux which is produced by one winding remains unchanged in magnitude, and links the other winding, changes its direction, or the number of turns of the other winding linked with the magnetic flux produced by said one winding is increased or decreased. Hence the output voltage is varied. The leakage impedances may be minimized.

Umted States Patent [1 1 [111 3,777,296

Ohyama et al. 1 Dec. 4, 1973 [54] ELECTROMAGNETIC INDUCTION 3,178,663 4/1965 Kahn, 336/120 APPARATUS 1,672,703 6/1928 West 336/120 2,882,483 4/1959 Stephenson"... 336/120 X Inventors: Masayuki y Takefumi 2,885,645 5/1959 Wennerberg 336/ Nakamizo, both of Toyonaka-shi, 2,823,363 2/1958 McKenney et a] 336/120 Osaka, Japan 2,872,603 2/1959 Herr 336/120 X [73] Assignee: Matsushita Electric Industrial Co., Primary Examiner Thomas J- Kozma Osaka-fl! Japan Attorney-Milton .1. Wayne et a1. [22] Filed: May 8, 1972 211 Appl. No.: 251,539 [57] ABSTRACT An electromagnetic induction apparatus is provided which comprises outer and inner cores and first and Foreign Application Priority Data second windings on the outer and inner cores. De-

May 10, 1971 Japan 46/31016 pending upon the relative angular position between June 16, 1971 46/43119 the first and second windings the effects of the mag- June 18, 1971 46/44372 netic fluxes produced by the first and second windings June 18, 1971 46/44404 upon the other or the degree of the inductive coupling June 18, 1971 Japan 46/44405 between the first and second windings may be varied, so that the output voltage may be varied accordingly. [52] US. Cl. 336/120, 336/ That is, the magnetic flux which is produced by one [51] Int. Cl. H0lf 21/00 winding remains unchanged in magnitude, and links [58 Field of Search 336/119, 120, 118, the other winding, changes its direction, or the num- 336/1 17, 1 15, 135, ber of turns of the other winding linked with the magnetic flux produced by said one winding is increased [56] References Cited or decreased. Hence the output voltage is varied. The

UNITED STATES PATENTS leakage impedances may be minimized.

2,550,663 5/1951 Bechberger et a1 336/120 X 18 Claims, 128 Drawing Figures PATENTEU 73 SHEEI 010! 32 PATENTEDUEE 4% 3.777. 296

sum as or 32 OUTPUT 9 FIG. |2A

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I i I I PATENTEDUEB 419% 3,777,296 SHEET 080F 32 FIG. I5A FIG. I5D

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SHEET 120F 32 FIG. 22

PATENYEU 41975 3.777.296

MEI IMF 32 PATEHEM: ms 3.777.296

sum 150F132 INPUT O *5 FIG. 29M

PATENTEU DEC 4 I975 SHEEI 16 0F 32 FlG.29E- FIG. 29F FIG.29G

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1. An electromagnetic induction apparatus comprising an outer core, an inner core which has a center hole and is disposed coaxially of said outer core, a first group of windings wound along the inner peripheral surface of said outer core and through said center hole of said inner core, and a second group of windings wound along the outer peripheral surface of and through said center hole of said inner core and inwardly of said first group of windings in a similar manner thereto, at least one of said first and second groups of windings being rotatable with respect to each other so that the relative angular position therebetween may be varied and that in response to said angular relative position the degree of the inductive coupling between said first and second groups of windings may be varied.
 2. An electromagnetic induction apparatus as set forth in claim 1 wherein at least one of said outer and inner cores is annular in shape.
 3. An electromagnetic induction appratus as set forth in claim 1 wherein at least one portion of each of the inner peripheral surface of said outer core and of the outer peripheral surface of said inner core is provided with slots for at least one portion of said first and second groups of windings.
 4. An electromagnetic induction apparatus as set forth in claim 1 wherein at least one of said outer and inner cores and said first and second groups of windings is provided with leakage flux preventive means.
 5. An electromagnetic induction apparatus as set forth in claim 1 wherein one of said first and second groups of windings which is connected to a supply circuit is electrically insulated against the other group of windings connected to a load circuit.
 6. An electromagnetic induction apparatus as set forth in claim 1 wherein one end of one of said first and second groups of windings which is connected to a load circuit is connected to a tap of the other group of windings which is connected to a supply circuit.
 7. An electromagentic induction apparatus as set forth in claim 3 wherein said slots are formed in parallel with the axis of said inner core.
 8. An electromagnetic induction apparatus as set forth in claim 3 wherein said slots are formed at angles relative to the axis of said inner core.
 9. An electromagnetic induction apparatus as set forth in claim 3 wherein said slots are bent at any point intermediate the ends thereof.
 10. An electromagnetic induction apparatus as set forth in claim 4 wherein said leakage flux preventive means comprises at least one recess formed at least on one of the inner peripheral surface of said outer core and the outer peripheral surface of said inner core.
 11. An electromagnetic induction apparatus as set forth in claim 4 wherein said leakage flux preventive means comprises an electrically conductive plate disposed along at least one of said inner peripheral surface of said outer core and the outer peripheral surface of said inner core.
 12. An electromagnetic induction apparatus as set forth in claim 6 wherein said first and second groups of windings are connected in series, and a load is connected between one of the terminals of said first and second groups of windings and a point of said series-connected circuit of said first and second groups of windings.
 13. An electromagneTic induction apparatus as set forth in claim 6 wherein said first or second group of windings is further divided into two subgroups the junction of which is connected to a supply circuit, and said first or second group of windings has its both ends connected to a load circuit in parallel with said second or first groups of windings connected to said load circuit.
 14. An electromagnetic induction apparatus as set forth in claim 6 wherein said first group of windings connected to said supply circuit is further divided into two subgroups the junction of which is connected to one terminal of said supply circuit together with one end of said second circuit connected to said load circuit; and one of the terminals of said first group of windings connected to said supply circuit and the other terminal of said first group of windings connected to said load circuit; and the other terminal of said second group of windings connected to said supply circuit and said load circuit.
 15. An electromagnetic induction apparatus as set forth in claim 6 wherein one half of said second group of windings connected to said load circuit is inductively positively coupled to said first group of windings connected to said supply circuit; the other half is further divided into two subgroups one of which is inductively positively coupled to and the other of which is inductively negatively coupled to said first group connected to said supply circuit; said winings connected to said load circuit are all connected in series and then connected in parallel to said group connected to said supply circuit; and said group of windings connected to said load circuit has its center tap connected to said load circuit.
 16. An electromagnetic induction apparatus comprising an outer core, an inner core disposed coaxially of said inner core, a first group of windings which are wound around said inner core so as to pass in the proximity of the axis of said inner core and extend across the points along the outer periphery thereof and in diametrially opposed relation, a second group of windings wound inwardly of said outer core but outwardly of said first group of windings in a manner similar thereto, either of or both of said outer and inner cores being rotatable relative to each other so that the relative angular position therebetween may be varied and that in response to said angular relative position the effects of the fluxes produced by said first and second groups of windings on the other may be varied. (The degree of the inductive coupling between said first and second groups of windings may be varied.)
 17. An electromagnetic induction apparatus comprising an outer core, an inner core disposed coaxially of said outer core, a first group of windings which are wound around said inner core in such a manner that said windings may pass through the points along the outer periphery of said inner core and symmetrical about the line passing through the center thereof and may also pass in the proximity of said center, a second group of windings wound inwardly of said outer core but outwardly of said first group of windings in a manner similar thereto, at least one of said inner and outer cores being rotatable with respect to the other so that the relative angular position therebetween may be varied and that in response to said angular relative position. The degree of inductive coupling between said first and second groups of windings may be varied.
 18. An electromagnetic induction apparatus comprising an outer core, an inner core disposed coaxially of said outer core, a first group of windings wound around the inner and outer peripheral surfaces of said outer core, a second group of windings wound around the outer peripheral surfaces of said inner and outer cores, at least one of said outer and inner core being rotatable with respect to each other so that the relative angular position therebetween may be varied and that in response to said relative angular position. The degree of induction coupling between said first and second groups of windings may be varied. 